How long can I work in Slovenia on a seasonal work permit?

For short engagements, seasonal work up to 90 days can be handled with a work permit issued by the Employment Service, without the fuller residence permit process.

If the seasonal work will last beyond 90 days, the situation changes: a stay of that length requires a single residence and work permit obtained through the administrative unit. In other words, the 90-day mark is the practical dividing line between the simpler short-term seasonal route and the longer combined permit.